Any floor epoxy that says Part one is just that, it is part one of two. You need and A and B mixed to get a true epoxy. If you read the can on most of the 1 part epoxy it tells you to put a specific primer down first. Then when you put the part 1 on top you have a true epoxy,
Otherwise you just painted the floor.
The rust-o-leum garage floor product is a pretty good product, However you must follow the instructions. The floor must be clean, dry and sound to begin the project.
Hot tires due tend to breakdown floor coating over time. Some products resist hot tire breakdown better than others.